LOCHINVAR GCBL-30R 4**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this gas tank unit. The registry does not state annual energy itself. This site computed 185 therms of natural gas from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at this draw pattern, the unit ranks 89th lowest for energy use. Its figure is 0 therms from the class median of 185 therms, which places it in the second-lowest quarter of its class. The calculation is described on the methodology page.

The registry gives a first hour rating, the gallons of hot water available in the first hour from a full tank, of 65 gallons, and a rated volume of 29 gallons. The energy figure fits a household whose hot-water use matches the medium draw pattern, a typical household on a busy morning. It does not describe a household with lower or higher use. The registry data do not include energy use at other draw patterns for this model, so that value is not available. A reader comparing fuel, space and size can use the water heater selector. The rating of 65 gallons is a registry figure and does not show how a particular home's demand compares.

Running cost is not stated here because it depends on the state average residential gas price, which differs between readers. The cost calculator applies that price, taken from the reader's ZIP, to the 185 therms at the medium draw pattern. Any total therefore holds only for that rate and that draw. A price range for this model is not published: its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. Because the unit sits 0 therms from the class median of 185 therms, its gas use matches a class-median unit at the same draw. To verify a like-for-like unit, the same-class replacement search starts from a model number such as GCBL-30R 4**.